Injected thermoplastic grey polyurethane with a nylon centre has a high wear resistance and good floor saving properties.The hardness 98°Shore A is lesser than for nylon, but still hard compared to cast polyurethane. The rolling resistance is slightly higher compared to nylon wheels. They are suitable to be used on clean and smooth surfaces, where a more resilient wheel than nylon is requested. Resistant to oils, fats and a wide range of chemicals. TPU has a higher resistance against cutting, abrasions, picking up gravel, metal shavings etc. than rubber and nylon.